Doorbolt



July 1925.

. 1,545,176 T. P. WHYTE DOORBOLT Filed April 17. 1 2 2 Sheets-She 1 T/z'omaaP/Wtf W 21 %M@WMZ Patented July 7, 1925 UNITED STATES THOMAS P; WHYTE, OF CHICAGO, ILLINOIS.

DOORBOLT.

Application filed April 17, 1922. Serial No. 553,826.

To all whom it may concern:

Be it known that I, THOMAS P. \VHYTE, a citizen of the United States, residing at Chicago, in the countymf Cook and State of Illinois, have invented certain new and useful Improvements in Doorbolts, of whlch the following is a specification.

Although the present invention may be adapted for general application, it is particularly directed to bolts such as are used on the exit doors of theaters or the like and commonly designated as panic bolts. Heretofore such bolts and their connections have usually been positioned on the face of the door and project therefrom. Such projecting parts have been found more or less objectionable as being unsightly and furthermore as interfering with the decoration or ornamentation of the doors. In some instances these doors are elaborately finished or ornamented and the projecting bolt and connected parts do not harmonize with such ornamentation. In accordance with the present invention I provide a bolt with most of the operating parts in a hidden or concealed position, thereby leaving the surface of the door unobstructed.

The objects of this invention are to provide an improved locking bolt for doors; to provide a door having a locking bolt arranged within the door and having its connecting rod and certain operating parts concealed; and to provide such flanges and novel features as will be described more fully hereinafter. r

In the accompanying drawings illustrating this invention;

Figure 1 is a front or inside view of a pair of doors with my bolt applied thereto; Figure 2 is a horizontal sectional View;

Figure 3 is an enlarged detail of the bolt;

Figure 4 is a sectional detail of the door and locking bolt;

Figure 5 is a sectional view taken on the line 5-5 of Figure 6; and v Figure 6 is a sectional view taken on the line 6-6 of Figure 5.

As shown in these drawings the doors 7 and 8 are hinged to the frame in the usual manner. and adapted to swing outwardly. The door 8 is provided with a strip of astragal 9 for holding the door 7 in closed position. These doors are preferably made of steel or sheet metal and have hollow stiles 10 or stiles with suitable recesses for receiving the locking bolt 11. This bolt comprises a casing 12 having a head or recess 13 in the upper end for receiving the catch or strike 14. The head has an outwardly projecting flange 15 which is secured to the top of the door by means of screws 16. The strike or catch 14 also has a flange 17 which is secured to the frame 18 by means of screws ,19. The catch 14 also has an outwardly projecting flange 20 which extends over the front edge of the casing 12 as shown in Figure 4, the casing also being offset as shown at 21 so as to make an angular opening between the front of the casing and the catch so that it will be diflicult or impossible to insert a knife or tool between these parts to release the bolt. The latch 22" is plvoted at 23 in the case 12 and its free end is pivotally connected to a link 24 which extends downwardly through a guide 25 in the casing 12 and its lower end is provided with a hook or projection 26 which engages with a slidable link or loop 27 which is mounted between vertical guideways 28 in the casing 12. Another link 29 has a hook or projection 30 which engages with the lower end of the link 27 and extends down through a hole or recess 30' in the bottom of the casing 12.

g This link has a collar or head 31 at its lower end which is adapted to engage with the casing to limit its upward movement and which is also threaded to receive a connecting rod 32. The link 29'and its connected parts are normally held in raised position by a cross bar 33 which is engaged by springs 34, the upper ends of these springs being held by pins 35 in the casing 12 The link 24 and its connected parts are normally held in raised position by a spring 36, the lower end of which abuts against the guide 25 while the upper end abuts against the head of the link 24.

The rod 32 extends down to a point adjacent to a handle or cross bar 37. This bar is pivoted at one end to a bracket 38 and at the opposite end to a bracket 39. The bracket 39 fits over a bearing block or support 40 which is-preferably split so that the inwardly projecting bearing members 41 will be brought into engagement with the bearing or collar 42 on a stem or rod 43, the upper end of which is threaded for engagement with the lower end of the rod 32. The stem 43 has a head 44 with lateral holes 45 for convenience in turning the same and this head fits against the lower face of the projections 41. The collar or enlargement 42 has a transverse hole 4-6 for receiving the arm l7 which projects inwardly from the end of the cross bar 37.

When the parts are to be assembled, the bolt ll is placed in position with the rod 32 extending downwardly through the stile. The bearing block with the stem 43 and connected parts mounted therein is then placed in position and the head 44 is turned to cause the upper end to engage with the lower threaded end of the rod 32 and draw the parts together as shown in Figure 5. The brackets and bar are then placed in position with the arm 47 passing through the opening 46 in the stem 45. It will be seen that the weight of the bar tends to hold the bolt in raised position so that the latch 13 will engage with the catch 14 when the door is closed and this action is supplemented by the action of the springs 34. WVhen the bolt is to he released, the bar 37 is swung upwardly which causes the arm 47 to press down on the stem 43 and thereby draw the rod 32 and link 29 downwardly against the tension of the springs 34. The link 29 pulls down on the link 27 which in turn pulls the link 24 down and releases the latch 22 from the catch 14. As soon as the handle a catch secured to the door frame and hav' ing an angular engaging face for engagement with a corresponding face of the bolt, a latch pivotally mounted to the bolt adapted to engage with the catch, a spring for holding the latch in raised position, a rod connected with said latch, a split bearing secured to the door, a stem rotatably mounted in said bearing and having its upper end threaded for engagement with the rod, and

a handle pivotally mounted on the door and having an arm engaging with said stem.

2. A door bolt comprising a casing, a latch pivotally mounted at one end of the casing, a link connected with said latch, a spring for holding the latch in normally raised position, a second link at the opposite end of the casing, a lost motion connection between said links, a rod connected with the last named link and springs tending to hold the last named link and connected parts in raised position.

3. The combination with a door, of a casing having a flanged head secured to the top of the door, a strike or catch secured to the door frame and adapted to nest into the head of the casing, a latch pivotally mounted in said casing and adapted to engage with said catch, a link connected with said latch extending downwardly, a spring tending to hold said latch and link in raised position, a loop engaging with the lower end of the link, a second link extending downwardly through the casing and having its upper end engaging with said loop, a spring for holding the last named link and connected parts in raised position, a connecting rod extending downwardly from the last named link, and means connected with said rod for actuating the same for releasing the latch.

4. A door bolt comprising a casing having a latch pivotally mounted at its upper end, a link connected with said latch and extending downwardly, a guide for said link, a spring coacting with the guide and link for holding the link in raised position, a loop slidably mounted in the casing and engaging with a projection on the link, a second link having a projection engaging with said loop and extending downwardly through the easing, a stop on said link for engagement with the bottom of the casing, a cross arm on said last named link and springs interposed between the cross arm and casing and tending to hold the link in raised position, the arrangement being such that the latch may be operated independently of the last named link but may be released by pulling downwardly on the link.

THOMAS P. WHYTE. 

